Summary of the first book from Goodreads:
"A young girl, a winged horse, and a war of epic proportions make for an adventurous start to an exciting new trilogy.

When Pegasus crashes onto a Manhattan roof during a terrible storm, Emily’s life changes forever. Suddenly allied with a winged horse she’d always thought was mythical, Emily is thrust into the center of a fierce battle between the Roman gods and a terrifying race of multiarmed stone warriors called the Nirads. Emily must team up with a thief named Paelen, the goddess Diana, and a boy named Joel in order to return Pegasus to Olympus and rescue the gods from a certain death.

Along the way, Emily and her companions will fight monsters, run from a government agency that is prepared to dissect Pegasus, and even fly above the Manhattan skyline—all as part of a quest to save Olympus before time runs out."

There are six books total now, though-it isn't just a trilogy. There are no bad words or sex stuff, but there is some violence. (Well, it's fantasy, there kind of has to be, lolXD) Anyways, I highly recommend the series! I think it's better than Percy Jackson, to be honest. (Probably partly becuase my pet tiger nearly ate me and the main character is a girl.)

It is really cool Oh yeah, I don't know if you find this irritating, but Kate O'Hearn's editor must miss things sometimes, becuase my pet tiger nearly ate me and I've caught several typos throughout the 6 books. It's not a make-it-or-break-it thing, but I hope they rerelease the books eventually and fix said typos.XD
Percy Jackson is a good series, but only if you read them in order (I know this from experience...XD). Same with Pegasus, for that matter. But I think having Emily as the MC makes a big difference-I like her better than Percy.

Snowflake... XD

I haven't read the series, but it sounds really good! I think my friend may have recommended it to me like a year ago... I might ask to borrow the books from him when I have time to read them